:root {
  color-scheme: light;
  --bg: #f6f2ea;
  --bg-deep: #ece4d7;
  --bg-glow: #fff8eb;
  --surface: #fdfcf8;
  --surface-elevated: #ffffff;
  --text: #1f2623;
  --muted: #5a645f;
  --muted-soft: rgba(32, 38, 35, 0.55);
  --border: rgba(32, 38, 35, 0.14);
  --border-soft: rgba(32, 38, 35, 0.08);
  --accent: #2f6f5f;
  --accent-focus: #2f6f5f;
  --accent-break: #c0895e;
  --accent-soft: rgba(47, 111, 95, 0.12);
  --slider-accent: var(--accent-focus);
  --ring-track: #e5dfd3;
  --ring-start: #2f6f5f;
  --ring-end: #3f7f6e;
  --ring-glow: rgba(47, 111, 95, 0.45);
  --ring-glow-soft: rgba(47, 111, 95, 0.15);
  --break-ring-start: #c0895e;
  --break-ring-end: #d2a173;
  --break-ring-glow: rgba(192, 137, 94, 0.45);
  --break-ring-glow-soft: rgba(192, 137, 94, 0.15);
  --button-primary-bg: var(--accent-focus);
  --button-primary-text: #ffffff;
  --button-primary-shadow-focus: 0 18px 35px rgba(47, 111, 95, 0.28);
  --button-primary-shadow-break: 0 18px 35px rgba(192, 137, 94, 0.28);
  --button-secondary-bg: transparent;
  --button-secondary-text: var(--text);
  --button-tertiary-bg: transparent;
  --button-tertiary-text: var(--muted);
  --button-icon-bg: rgba(32, 38, 35, 0.05);
  --button-icon-border: var(--border-soft);
  --input-bg: #ffffff;
  --input-text: var(--text);
  --input-border: rgba(32, 38, 35, 0.16);
  --input-disabled-bg: rgba(32, 38, 35, 0.04);
  --input-disabled-text: rgba(32, 38, 35, 0.5);
  --focus-ring: rgba(47, 111, 95, 0.35);
  --hover-soft: rgba(32, 38, 35, 0.06);
  --surface-popover: #ffffff;
  --surface-toast: #ffffff;
  --shadow: 0 35px 70px rgba(22, 26, 24, 0.12);
  --shadow-elevated: 0 12px 30px rgba(25, 30, 28, 0.12);
  --shadow-popover: 0 16px 30px rgba(25, 30, 28, 0.18);
  --ambient-glow: rgba(47, 111, 95, 0.14);
  --ambient-glow-clear: rgba(47, 111, 95, 0);
}

html[data-theme="light"] {
  color-scheme: light;
}

html[data-theme="dark"] {
  color-scheme: dark;
  --bg: #0f1513;
  --bg-deep: #090d0b;
  --bg-glow: #1a2420;
  --surface: #18201d;
  --surface-elevated: #24302b;
  --text: #e6eee8;
  --muted: #a2b1a8;
  --muted-soft: rgba(226, 236, 228, 0.58);
  --border: rgba(226, 236, 228, 0.22);
  --border-soft: rgba(226, 236, 228, 0.12);
  --accent: #6cbba3;
  --accent-focus: #6cbba3;
  --accent-break: #d8a177;
  --accent-soft: rgba(108, 187, 163, 0.22);
  --slider-accent: var(--accent-focus);
  --ring-track: #2d3a34;
  --ring-start: #6cbba3;
  --ring-end: #8ad0bb;
  --ring-glow: rgba(108, 187, 163, 0.5);
  --ring-glow-soft: rgba(108, 187, 163, 0.22);
  --break-ring-start: #d8a177;
  --break-ring-end: #e4ba95;
  --break-ring-glow: rgba(216, 161, 119, 0.5);
  --break-ring-glow-soft: rgba(216, 161, 119, 0.22);
  --button-primary-bg: var(--accent-focus);
  --button-primary-text: #0f1714;
  --button-primary-shadow-focus: 0 18px 35px rgba(108, 187, 163, 0.34);
  --button-primary-shadow-break: 0 18px 35px rgba(216, 161, 119, 0.34);
  --button-secondary-bg: transparent;
  --button-secondary-text: var(--text);
  --button-tertiary-bg: transparent;
  --button-tertiary-text: var(--muted);
  --button-icon-bg: rgba(226, 236, 228, 0.1);
  --button-icon-border: var(--border-soft);
  --input-bg: #202925;
  --input-text: #e6eee8;
  --input-border: rgba(226, 236, 228, 0.24);
  --input-disabled-bg: rgba(226, 236, 228, 0.06);
  --input-disabled-text: rgba(226, 236, 228, 0.5);
  --focus-ring: rgba(108, 187, 163, 0.5);
  --hover-soft: rgba(226, 236, 228, 0.1);
  --surface-popover: #202925;
  --surface-toast: #202925;
  --shadow: 0 35px 70px rgba(0, 0, 0, 0.45);
  --shadow-elevated: 0 12px 30px rgba(0, 0, 0, 0.38);
  --shadow-popover: 0 16px 30px rgba(0, 0, 0, 0.45);
  --ambient-glow: rgba(108, 187, 163, 0.18);
  --ambient-glow-clear: rgba(108, 187, 163, 0);
}

@media (prefers-color-scheme: dark) {
  html:not([data-theme]) {
    color-scheme: dark;
    --bg: #0f1513;
    --bg-deep: #090d0b;
    --bg-glow: #1a2420;
    --surface: #18201d;
    --surface-elevated: #24302b;
    --text: #e6eee8;
    --muted: #a2b1a8;
    --muted-soft: rgba(226, 236, 228, 0.58);
    --border: rgba(226, 236, 228, 0.22);
    --border-soft: rgba(226, 236, 228, 0.12);
    --accent: #6cbba3;
    --accent-focus: #6cbba3;
    --accent-break: #d8a177;
    --accent-soft: rgba(108, 187, 163, 0.22);
    --slider-accent: var(--accent-focus);
    --ring-track: #2d3a34;
    --ring-start: #6cbba3;
    --ring-end: #8ad0bb;
    --ring-glow: rgba(108, 187, 163, 0.5);
    --ring-glow-soft: rgba(108, 187, 163, 0.22);
    --break-ring-start: #d8a177;
    --break-ring-end: #e4ba95;
    --break-ring-glow: rgba(216, 161, 119, 0.5);
    --break-ring-glow-soft: rgba(216, 161, 119, 0.22);
    --button-primary-bg: var(--accent-focus);
    --button-primary-text: #0f1714;
    --button-primary-shadow-focus: 0 18px 35px rgba(108, 187, 163, 0.34);
    --button-primary-shadow-break: 0 18px 35px rgba(216, 161, 119, 0.34);
    --button-secondary-bg: transparent;
    --button-secondary-text: var(--text);
    --button-tertiary-bg: transparent;
    --button-tertiary-text: var(--muted);
    --button-icon-bg: rgba(226, 236, 228, 0.1);
    --button-icon-border: var(--border-soft);
    --input-bg: #202925;
    --input-text: #e6eee8;
    --input-border: rgba(226, 236, 228, 0.24);
    --input-disabled-bg: rgba(226, 236, 228, 0.06);
    --input-disabled-text: rgba(226, 236, 228, 0.5);
    --focus-ring: rgba(108, 187, 163, 0.5);
    --hover-soft: rgba(226, 236, 228, 0.1);
    --surface-popover: #202925;
    --surface-toast: #202925;
    --shadow: 0 35px 70px rgba(0, 0, 0, 0.45);
    --shadow-elevated: 0 12px 30px rgba(0, 0, 0, 0.38);
    --shadow-popover: 0 16px 30px rgba(0, 0, 0, 0.45);
    --ambient-glow: rgba(108, 187, 163, 0.18);
    --ambient-glow-clear: rgba(108, 187, 163, 0);
  }
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: radial-gradient(1200px 600px at 12% 8%, var(--bg-glow) 0%, var(--bg) 45%, var(--bg-deep) 100%);
  color: var(--text);
  font-family: "Manrope", "Avenir Next", "Trebuchet MS", sans-serif;
}

.app {
  width: min(90vw, 760px);
  padding: 48px 56px 56px;
  border-radius: 32px;
  background: var(--surface);
  border: 1px solid var(--border-soft);
  box-shadow: var(--shadow);
  position: relative;
  overflow: hidden;
}

.app::before {
  content: "";
  position: absolute;
  top: -140px;
  right: -120px;
  width: 320px;
  height: 320px;
  background: radial-gradient(circle, var(--ambient-glow) 0%, var(--ambient-glow-clear) 70%);
  border-radius: 50%;
  pointer-events: none;
}

.top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 24px;
  margin-bottom: 40px;
}

.top-controls {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 8px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 16px;
}

.brand-mark {
  width: 46px;
  height: 46px;
  display: block;
  object-fit: contain;
}

.brand-name {
  font-size: 1.2rem;
  font-weight: 600;
  letter-spacing: 0.02em;
}

.brand-tagline {
  font-size: 0.9rem;
  color: var(--muted);
}

.preset-group {
  display: flex;
  gap: 12px;
  background: var(--accent-soft);
  padding: 6px;
  border-radius: 999px;
}

.preset-button {
  border: none;
  background: transparent;
  color: var(--muted);
  font-size: 0.95rem;
  padding: 8px 16px;
  border-radius: 999px;
  cursor: pointer;
  transition: color 0.2s ease, background 0.2s ease, transform 0.2s ease;
}

.preset-button[aria-checked="true"] {
  background: var(--surface-elevated);
  color: var(--text);
  box-shadow: var(--shadow-elevated);
}

.theme-toggle {
  border: 1px solid var(--border-soft);
  border-radius: 999px;
  background: var(--button-icon-bg);
  color: var(--muted);
  font-family: inherit;
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 6px 11px;
  min-width: 58px;
  cursor: pointer;
  transition: background 0.2s ease, color 0.2s ease, transform 0.2s ease;
}

.theme-toggle:hover {
  color: var(--text);
  background: var(--hover-soft);
}

.theme-toggle:active {
  transform: translateY(1px);
}

.theme-toggle:focus-visible {
  outline: 2px solid var(--focus-ring);
  outline-offset: 2px;
}

.preset-button:disabled {
  cursor: not-allowed;
  opacity: 0.6;
}

.timer-panel {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 24px;
  position: relative;
}

.ring-wrap {
  position: relative;
  width: min(72vw, 320px);
  height: min(72vw, 320px);
  display: grid;
  place-items: center;
}

.ring {
  width: 100%;
  height: 100%;
  transform: rotate(-90deg);
}

.ring-track {
  fill: none;
  stroke: var(--ring-track);
  stroke-width: 12;
}

.ring-progress {
  fill: none;
  stroke: url(#ringGradient);
  stroke-width: 12;
  stroke-linecap: round;
  stroke-dasharray: 0;
  stroke-dashoffset: 0;
}

.time-block {
  position: absolute;
  text-align: center;
  display: flex;
  flex-direction: column;
  gap: 6px;
  align-items: center;
}

.mode-label {
  text-transform: uppercase;
  letter-spacing: 0.28em;
  font-size: 0.7rem;
  color: var(--muted);
  transition: color 0.3s ease, transform 0.3s ease, opacity 0.3s ease;
}

.time-display {
  font-family: "Fraunces", "Georgia", serif;
  font-size: clamp(3.2rem, 5vw, 5rem);
  font-weight: 400;
  letter-spacing: 0.04em;
  line-height: 1.05;
}

.cycle-indicator {
  font-size: 0.75rem;
  color: var(--muted);
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.sub-label {
  font-size: 0.9rem;
  color: var(--muted);
}

.sets-row {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: clamp(16px, 3vw, 22px);
  white-space: nowrap;
}

.sets-item {
  display: inline-flex;
  align-items: center;
  gap: 10px;
}

.sets-stepper {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.sets-label,
.sets-value {
  font-size: 0.9rem;
  color: var(--muted);
  font-family: inherit;
}

.sets-value {
  min-width: 2ch;
  text-align: center;
}

.sets-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 2px 6px;
  border: none;
  background: none;
  font: inherit;
  line-height: 1;
  color: var(--muted);
  cursor: pointer;
  opacity: 0.8;
  transition: transform 0.2s ease, background 0.2s ease, color 0.2s ease, opacity 0.2s ease;
}

.sets-btn:hover,
.sets-btn:focus-visible {
  opacity: 1;
  color: var(--text);
  background: var(--hover-soft);
  border-radius: 999px;
}

.sets-btn:active {
  transform: translateY(1px);
}

.sets-btn:focus-visible {
  outline: 2px solid var(--focus-ring);
  outline-offset: 2px;
}

.controls {
  display: flex;
  gap: 16px;
  align-items: center;
}

.secondary-actions {
  display: flex;
  align-items: center;
  gap: 16px;
}

.btn {
  border: none;
  border-radius: 999px;
  padding: 12px 24px;
  font-size: 1rem;
  cursor: pointer;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease, color 0.2s ease;
}

.btn.primary {
  background: var(--button-primary-bg);
  color: var(--button-primary-text);
  box-shadow: var(--button-primary-shadow-focus);
  min-width: 140px;
}

.app[data-mode="break"] .btn.primary {
  background: var(--accent-break);
  box-shadow: var(--button-primary-shadow-break);
}

.btn.secondary {
  background: var(--button-secondary-bg);
  color: var(--button-secondary-text);
  border: 1px solid var(--border);
}

.btn.tertiary {
  background: var(--button-tertiary-bg);
  color: var(--button-tertiary-text);
  border: 1px solid var(--border-soft);
}

.btn.icon {
  padding: 10px;
  width: 44px;
  height: 44px;
  display: grid;
  place-items: center;
  background: var(--button-icon-bg);
  border: 1px solid var(--button-icon-border);
}

.audio-control {
  position: relative;
  display: inline-flex;
  align-items: center;
}

.volume-panel {
  position: absolute;
  right: 0;
  bottom: calc(100% + 10px);
  background: var(--surface-popover);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-popover);
  padding: 8px 12px;
  border-radius: 12px;
  z-index: 2;
  opacity: 0;
  transform: translateY(6px);
  pointer-events: none;
  transition: opacity 0.2s ease, transform 0.2s ease;
}

.audio-control.is-open .volume-panel {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

.volume-slider {
  width: 140px;
  accent-color: var(--slider-accent, var(--accent-focus));
}

.btn:hover {
  transform: translateY(-1px);
}

.btn:active {
  transform: translateY(1px);
}

.btn:focus-visible {
  outline: 3px solid var(--focus-ring);
  outline-offset: 3px;
}

.icon-svg {
  width: 20px;
  height: 20px;
  stroke: var(--text);
  stroke-width: 1.6;
  fill: var(--text);
}

.icon-wave {
  fill: none;
  stroke-linecap: round;
  opacity: 0;
}

.icon-slash {
  stroke-linecap: round;
  opacity: 0;
  fill: none;
}

.btn.icon.is-on .icon-wave {
  opacity: 1;
}

.btn.icon.is-muted .icon-slash {
  opacity: 1;
}

.custom-panel {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
  padding: 0;
  margin: 0;
  max-height: 0;
  overflow: hidden;
  background: var(--accent-soft);
  border-radius: 18px;
  border: 0 solid var(--border-soft);
  opacity: 0;
  transform: translateY(-6px);
  pointer-events: none;
  transition: opacity 0.25s ease, transform 0.25s ease, max-height 0.25s ease, margin 0.25s ease,
    padding 0.25s ease;
}

.custom-panel.is-visible {
  padding: 16px;
  margin: 0 0 32px;
  max-height: 200px;
  border-width: 1px;
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

.custom-field {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 6px 8px;
  font-size: 0.8rem;
  color: var(--muted);
}

.custom-field span:first-child {
  grid-column: 1 / -1;
}

.custom-field input {
  border: 1px solid var(--input-border);
  border-radius: 10px;
  padding: 6px 10px;
  font-size: 0.95rem;
  color: var(--input-text);
  font-family: "Manrope", "Avenir Next", "Trebuchet MS", sans-serif;
  background: var(--input-bg);
}

.custom-field input:focus-visible {
  outline: 2px solid var(--focus-ring);
  outline-offset: 2px;
}

.custom-field input:disabled {
  background: var(--input-disabled-bg);
  color: var(--input-disabled-text);
}

.custom-field .unit {
  align-self: center;
  font-size: 0.75rem;
  color: var(--muted-soft);
}

.completion-toast {
  position: absolute;
  left: 50%;
  bottom: 32px;
  transform: translate(-50%, 12px);
  background: var(--surface-toast);
  padding: 10px 20px;
  border-radius: 999px;
  border: 1px solid var(--border);
  box-shadow: var(--shadow-popover);
  font-size: 0.9rem;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease, transform 0.3s ease;
}

.completion-toast.is-visible {
  opacity: 1;
  transform: translate(-50%, 0);
}

.timer-panel.is-complete .ring-progress {
  filter: drop-shadow(0 0 10px var(--ring-glow));
  animation: ringPulse 1.1s ease;
}

.app[data-mode="break"] {
  --ring-start: var(--break-ring-start);
  --ring-end: var(--break-ring-end);
  --ring-glow: var(--break-ring-glow);
  --ring-glow-soft: var(--break-ring-glow-soft);
  --slider-accent: var(--accent-break);
}

@keyframes ringPulse {
  0% {
    filter: drop-shadow(0 0 0 rgba(0, 0, 0, 0));
  }
  40% {
    filter: drop-shadow(0 0 14px var(--ring-glow));
  }
  100% {
    filter: drop-shadow(0 0 6px var(--ring-glow-soft));
  }
}

@media (max-width: 720px) {
  .app {
    padding: 32px 28px 36px;
  }

  .top {
    flex-direction: column;
    align-items: flex-start;
  }

  .top-controls {
    width: 100%;
    align-items: flex-start;
  }

  .custom-panel {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .controls {
    flex-direction: column;
    width: 100%;
  }

  .secondary-actions {
    width: 100%;
    display: flex;
    flex-direction: column;
    gap: 16px;
  }

  .sets-row {
    justify-content: center;
    flex-wrap: nowrap;
    gap: 16px;
    white-space: nowrap;
  }

  .btn.primary {
    width: 100%;
  }

  .secondary-actions .btn {
    width: 100%;
  }
}

@media (max-width: 420px) {
  .sets-row {
    flex-wrap: wrap;
    white-space: normal;
  }
}

@media (max-width: 480px) {
  .app {
    padding: 18px 14px 20px;
  }

  .top {
    align-items: center;
    gap: 10px;
    margin-bottom: 14px;
  }

  .brand {
    gap: 10px;
  }

  .brand-mark {
    width: 34px;
    height: 34px;
  }

  .brand-copy {
    text-align: left;
  }

  .brand-name {
    font-size: 1.02rem;
  }

  .brand-tagline {
    font-size: 0.76rem;
  }

  .top-controls {
    width: 100%;
    align-items: center;
    gap: 6px;
  }

  .preset-group {
    gap: 8px;
    padding: 4px;
  }

  .preset-button {
    font-size: 0.84rem;
    padding: 6px 12px;
  }

  .theme-toggle {
    font-size: 0.68rem;
    letter-spacing: 0.06em;
    padding: 5px 10px;
    min-width: 54px;
  }

  .custom-panel.is-visible {
    margin: 0 0 18px;
  }

  .timer-panel {
    gap: 14px;
  }

  .ring-wrap {
    width: min(64vw, 280px);
    height: min(64vw, 280px);
  }

  .time-block {
    gap: 4px;
  }

  .mode-label {
    font-size: 0.62rem;
    letter-spacing: 0.22em;
  }

  .cycle-indicator {
    font-size: 0.66rem;
    letter-spacing: 0.1em;
  }

  .time-display {
    font-size: clamp(2.5rem, 10vw, 3.2rem);
  }

  .sub-label {
    font-size: 0.78rem;
  }

  .controls {
    gap: 8px;
    align-items: center;
  }

  .controls > .btn.primary {
    width: auto;
    min-width: 148px;
    min-height: 44px;
    padding: 10px 24px;
    font-size: 0.95rem;
  }

  .secondary-actions {
    width: auto;
    flex-direction: row;
    justify-content: center;
    align-items: center;
    gap: 10px;
  }

  .secondary-actions .btn {
    width: auto;
    min-width: 106px;
    min-height: 40px;
    padding: 8px 14px;
    font-size: 0.86rem;
  }

  .audio-control {
    margin-top: 2px;
  }

  .btn.icon {
    width: 40px;
    height: 40px;
    padding: 8px;
  }

  .sets-row {
    margin-top: 2px;
    gap: 10px;
    flex-wrap: nowrap;
    white-space: nowrap;
  }

  .sets-item {
    gap: 6px;
  }

  .sets-stepper {
    gap: 6px;
  }

  .sets-label,
  .sets-value {
    font-size: 0.82rem;
  }

  .sets-btn {
    padding: 1px 5px;
  }
}

@media (prefers-reduced-motion: reduce) {
  * {
    animation: none !important;
    transition: none !important;
  }
}